Can with telescopic cover and imperforate continuous lining



Dec. 22, 1964 w. L. GEIST 3,162,346

CAN WITH TELESCOPIC COVER AND IMPERFORATE CONTINUOUS LINING Original Filed May 27, 1959 2 sheets sheet l FIG! FIG 3 INVENTOR. lV/ZZ/i Z, 616757 Dec. 22, 1964 w. L. GEIST CAN WITH TELESOOPIC COVER AND IMPERF'ORATE CONTINUOUS LINING Original Filed May 27, 1959' 2 Sheets-Sheet 2 FIG 4 United States Patent 3,162,346 CAN WKTH TELESCOPE: CUVER AND IMPER- FORATE CONTENUOUS LINENG William L. Geist, St. Louis, Mo., assignor to RC. Can

This invention relates to the art of paper can manufacture, and more specifically to a new kind of paper tube body for a paper can and the paper can formed therefrom by the method of manufacture disclosed and claimed in my co-pending application for patent Serial No. 816,215, filed May 27, 1959, now Patent No. 2,988,970, for Method of Making Paper Can Body With Telescopic Sections, of which application this is a division. The method therein described forms a can body with separable telescopic sections adapted by its construction to be closed by metal ends or the like which are, in turn, secured to all of the plies of the container to form a leakproof joint therewith. By the use of this method it is possible to construct a can body of multiply paper wherein one of the layers, preferably the liner, remains completely intact, so that, when the container ends form the can, the liner and the can ends form a complete imperforate container of novel construction which can be, by a twist, separated intermediate its length for access to its contents.

The invention is illustrated and hereinafter described as applied to a can body formed by spirally wound plies of paper, but it should be clearly understood that the manner of forming the can body by spirally Wound tapes is the preferred manner of making the invention, which results in a product with an imperforate liner.

The structure of the instant invention can be built by a minimum of manufacturing steps, such as:

(1) Winding successive plies of paper tape on a conventional mandrel in a conventional winding machine to form a liner, an inner tube, and an outer tube in superimposed relation, all in a single operational step.

(2) Cutting the completed tube on three spaced lines lengthwise to sever the tube circumferentially, but only partially radially. Two of these cuts are made from the outside in, and one is from the inside out, in a manner so that the outer cuts straddle the inner cuts; one of the outer cuts severs or perforates through the outer and inner plies to the liner; one of the outer cuts severs or perforates through the outer tube to the inner tube; and the inner cut severs the liner and the inner tube.

(3) The tube, after being so cut at intervals along its length, is then separated into sections at the line along the cut through the outer tube from the outside, and at the cut through the inner tube and liner performed by the inner knife, by slipping apart the telescoped section between these cuts. Each separate section forms a body for a single can, therefore, and, when so separated, each body has stepped ends and is out between its ends through the outer and inner tubes to the liner.

(4) The last step is one which eliminates the stepped ends on opposite ends of the tube by sliding the inner and outer tubes relative to one another into alignment. This forms a complete can body with an imperforate liner and cuts in the outer and inner tube spaced lengthwise of the body to form a telescopic section therein, one end being the body and the other end the cover.

The instant invention is therefore based upon a dis tinctly new concept in manufacture which eliminates hal of the previous steps involved, and, furthermore, any

manual operations which were heretofore necessary. In

3,162,346 Patented Dec. 22, 1964 the preferred construction at least five plies of paper are successively wound spirally on the mandrel of a conventional winding machine to form continuous inner and outer tubes. In the winding operation, the second and fourth plies and the outside of the liner are coated with adhesive. No adhesive is placed between the plies forming the outer tube and the plies forming the inner tube. Continuous tubes are formed which can be cut by a flying rotary knife or saw into lengths equal to two or more cans. Each of these separated lengths of tubing is then placed upon a suitable mandrel having opposed cooperating knives arranged in the manner above described, which slit or perforate to form the consecutive cuts from the outside through the four outer plies, from the inside through the liner and the two inner plies, and from the outside through the two outer plies, at spaced locations along the length of the tube.

When the can bodies are spirally wound, it is usually necessary to have two or more plies of paper for both the inner tube and the outer tube in order to hold each wall together, or it is necessary to have a single ply for each tube with overlapped edges glued in order to hold together. The type with overlapping joint would normally have the disadvantage of an offset surface Where it is overlapped. However, this would not interfere with the construction and the practice of the method. In the winding operation, the outermost layer may be a printed label to add finish to the container.

The outer and inner tubes are brought into a condition with their ends in a single plane, a metal end is spun onto the open end of the body of the tube, and in the spinning operation it is usually desirable to have the metal cover tightly crimped into sealing relation with all of the plies of the tube in order to give the necessary strength and, of course, to provide a hermetic seal with the liner of the tube. This method and manner of manufacture accomplishes this desirable feature. The can with one metal end is usually shipped to the packager, who fills the body of the container and applies the opposite metal end in the same manner as the first. The filled container is very strong, due to the fact that the liner is imperforate from one end to the other. It will therefore withstand considerable internal pressure without damage or seepage of any kind, thus protecting the contents against contamination.

The user or purchaser simply twists opposite ends of the tube forming the can body, one end with respect to the other, which separates the tube to form a telescopic cover. This makes a convenient form of container which may be reciosed, but cannot be resealed, and is thus very attractive to certain users. Because it cannot be rescaled, it is a non-refillable container.

Further objects and advantages will appear from the following detailed description and accompanying illustrations, in which:

IG. 1 is a further enlarged sectional view of the tube for a single can body after a step forming operation has been performed on its opposite ends by suitable cutters;

FIG. 2 is an enlarged sectional view showing the tube, such as in FIG. 1, after the inner and outer tubes have been slipped, relative to one another, so that their ends are in the same plane;

FIG. 3 is a view illustrating the complete body of the can; and

FIG. 4 is a view illustrating a completed telescopic cover separated from the body of the can. i

In this particular case there are five rolls of tape used to form the tube shown in FIG. 1 by winding these tapes in a tube winding machine. Tape 1 forms the liner for the tube. Tapes 2 and 5 form the inner tube, and tapes machine illustrated in 4 and the outer tube. Tapes 1, 2 and 3 are adhesively secured together to forrnthe'inner tube, and tapes 4 and 5 are adhesively secured together to form the outer tube.

No adhesive is applied betweentape 4 and tape 3, since.

it is desirable in the process to slidethe'innentube relative to-the outer tube as .one'of .thesteps, in ,torrning the telescopic can;

i all of the objects of the FIG. 1 showsone of these tubes.v T when separated from other tubes just" like it. 1 As the tubes leave the F1652, shown inmy Patent No.

2,988,970, therefore, I and are subsequently gseparated, they appear as shown inFIG: 1 with .oneend thereof, such as 35,stepped externallyeand the opposite, end, such as 36-, stepped internally. Intermediate remains unsevered-except at the ends;

Each ofythese tubes, such as T is then placed in .a machine which knocks theouter plies and inner plies into alignment so that theends thereof are in a single vplane, such as shownin FIG, 2, and this step, 7

the ,two ends is a score or cut 40 'which extends through the outer tube and through-the inner tube to the liner, but the liner therefore, forms j a completed body tube including anexternally istepp edfi body Stland an intern'ally stepped cover such: as 51;.

But the liner 45'is continuous V 7 tube T and imperforate. When the metal or otherkind of end is secured to thejopposite ends of the tube, I

the resulting structure is ayco'inplete can of greatstrength,

fromend to end of'the' since the cover can be secured to all of the plies on each end, and to an in perforate lining for holding rthe cover and the body of the can together.

added strength.

In the knocking operation the can into alignment, the'cut becomes oltset as at 40' 40 in the, outer tube 42 the can body and the cover. 7

FIGS. 3 and 4 indicate the completed can with the cover separated so as to 9 tion and the'fact that the Obviously, a I label can be placed: over the outside of; the container for whichkbrings the ends of 5 from the cut through the inner .7 tube 43, thus for'mingthe telescopic connection between 4 illustrate the telescopic connec- :coven part and said can a rnulti-ply paper tube,

todisconnect the two can anda cover A construction has sections of the tube to form a been described which will fulfill present invention, but it is contcmplated that other modifications will be obvious to those skilled in the art which come within the scope of the invention as defin'ed by tie'appended elairns.

I claim: i v i 7 I 1,,AI reusable, non-refillable, multi-ply paper can with an imperforate liner, said can and liner: being'forrned of'a plurality of spirally 'woundtapes adhes'ively secured in overlapping, relation having a telescoping-section between said' plies fora can cover part and a can body'part which are separable only by rupture of the imperforate liner adjacent the telescoping connection-between said can body park-said can comprising and spaced circumferential scores each eitte'ndingthrough different plies'formingthe tube butnot throughsaid'liner'for defining parting lines for said telescoping section; r i

p 2. Af-reus'able, non-refillable, multi-ply paper can with an imperfor'at'e liner' and 'a telescoping section between said plies for a cancover part and a-can b'ody part whichfare separable? only 'by' rupture ofthedmperforate liner adjacent the telescoping connection between said cover part' and said can body part-,said can and'linercomprising a multi-ply -tube, and spaced circumferential scdres each extending throt'ighldilierent plies-forming the tube butnotfthroughsaidjliner' for defining parting lines for said,telescopingscction i ReferencesQited the file'bf this patent UN TE? ST TE PATENTS 1,943,796

I Hartmann "Jan. 16, 1934 2,130,355 Magill Sept. 20, 1938 ,'5 2,349,730 'Horning 'May '2 3 1944 liner must be severed in'order 

1. A REUSABLE, NON-REFILLABLE, MULTI-PLY PAPER CAN WITH AN IMPERFORATE LINER, SAID CAN AND LINER BEING FORMED OF A PLURALITY OF SPIRALLY WOUND TAPES ADHESIVELY SECURED IN OVERLAPPING RELATION HAVING A TELESCOPING SECTION BETWEEN SAID PLIES FOR A CAN COVER PART AND A CAN BODY PART WHICH ARE SEPARABLE ONLY BY RUPTURE OF THE IMPERFORATE LINER ADJACENT THE TELESCOPING CONNECTION BETWEEN SAID CAN COVER PART AND SAID CAN BODY PART, SAID CAN COMPRISING A MULTI-PLY PAPER TUBE, AND SPACED CIRCUMFERENTIAL SCORES EACH EXTENDING THROUGH DIFFERENT PLIES FORMING THE TUBE BUT NOT THROUGH SAID LINER FOR DEFINING PARTING LINES FOR SAID TELESCOPING SECTION. 